lecture 6

Question 1

deep bite etiologies

Answer 1

*Skeletal
*Overeruption of incisors
*Undereruption of molars
or combo of I/M patterns

Question 2

dentoalveolar processes of deep bites

Answer 2

I/M eruptions, typically reversiable processes with current malocclusion

Question 3

what is the normal UI overlap to LI

Answer 3

15-20%

Question 4

Transverse dimension
*Usually in form of?
* mandible?
*Some are also caused by?

Answer 4

*Usually maxillary transverse deficiency
*Maybe caused by overdeveloped mandible (skeletal)
*Some are also caused by unfavorable dental angulations (dentoalveolar)

Question 5

possible tx

Answer 5

Question 6

Disturbances of Dental Development

Answer 6

1. Congenitally missing teeth
2. Malformed and supernumerary teeth
3. Interference with eruption
4. Ectopic eruption
5. Early loss of primary teeth

Question 7

interference of eruption mechanisms

Answer 7

due to lack of space leading to: impaction and ectopic eruption

Question 8

what to do when there is early loss of primary teeth?

Answer 8

space maintenance

Question 9

1. Congenitally Missing Teeth

Answer 9

*Anodontia (very rare)
*Oligodontia (several teeth missing) (>4)

Question 10

what is wrong

Answer 10

Question 11

what is happening here?

Answer 11

oligodontia

Question 12

Dr Moyers’ Explanations for Congenitally
Missing Teeth
*Heredity?
*syndrome?
*Localised events?
*Systemic?
*Evolutionary changes?

Answer 12

*Heredity
*Ectodermal Dysplasia
*Localised inflammations or infections
*Systemic conditions, e.g. ricketts
*Evolutionary changes in the dentition (specially third molars)

Question 13

commonly missing teeth as a genetic trend

Answer 13

LI, lower CI, mandibular PM

Question 14

Ectodermal dysplasia leads to:

Answer 14

*Oligodontia
*Poorly shaped teeth

Question 15

Most frequently missing teeth based on demos

Answer 15

*Upper lateral incisors (caucasians)
*Lower second premolars (all)
*Lower central incisor (asian)

Question 16

result of missing lower CI

Answer 16

increased overjet and canines not in class 1 relation

Question 17

Missing second premolar tx?

Answer 17

determine with age, root form and occ plane: typically extract and place implant when older

Question 18

Malformed Teeth

Answer 18

*“Peg” maxillary lateral incisors
*Crown can be mishaped
*Root may be shortened

Question 19

Mesio Distal Size of the Dentition (bolton)
factors

Answer 19

*Proportionality of tooth sizes within a dentition
*Bolton ratio
factors: tooth and arch size

Question 20

Bolton ratio

Answer 20

Overall: M 1st to M of opposite 1st M in each arch
Anterior: same with canines
*In order to develop a proper overbite and overjet, the size of the lower dentition must be proportional to the size of the upper dentition
*This proportion is called the Bolton ratio.

Question 21

Overall and anterior ideal ranges for boltons ratio

Answer 21

overall: 87-94 (91%)
anterior: 75-80% (77%)

Question 22

forms of supernumerary teeth

Answer 22

mesiodens
supernumerary lateral incisor

Question 23

impacted tooth prognosis

Answer 23

guarded

Question 24

Impacted upper central incisors
most often due to?
root may become?
how else can these occur?

Answer 24

*Most often caused by trauma to the deciduous tooth. Root can become dilacerated
*Infection of deciduous central
*Cyst
*Supernumary tooth

Question 25

Impacted cuspids

Answer 25

*Upper cuspids are the teeth most often impacted (3 to 4%) *Treatment is difficult and costly

Question 26

Etiology (Theories) of impacted teeth 1. upper arch? 2. A combination of? 3. Missing or small?

Answer 26

1. Narrow upper arch causes a strong probability of impaction**. Not valid in the majority of cases** 2. A combination of genetics and familial tendencies 3. Missing or small lateral incisors, but a normally sized arch

Question 27

majority of malocc from what origins

Answer 27

combo skeletal and dentoalveolar

Question 28

environment and genetics roles in malocc

Answer 28

*Genetics plays a significant role in the etiology but functional factor are also contributing factors

Question 29

*The treatmetn approach will be defined by:

Answer 29

*The treatmetn approach will be defined by the capacity to assess the etiology of the malocclusion as accurately as possible